The ASURA range of filters are made by the world leader in ductless filter manufacturing so you can be assured of maximum performance and safety. It is very important that your check your aplication on a regular basis. If it is a while since you last checked your applications or since you replaced your filter e would strngly advise that you fill out our on-line filter questionnnaire to ensure you have the right filter for your hood. We will advise you of the recommended lifetime as well.